Furnace-door.



L. nox. Y FURNACE DOOR.

(Application fl1ed Ma.y 5, 1902.)

Patented Sept 9, I902.

(No Model.)

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UNITED STATES PATENT OFFICE.

LUTHER L. KNOX, OF PITTSBURG, PENNSYLVANIA.

FURNACE-DOOR.

SPECIFICATION forming part of Letters Patent No. 708,719, dated September 9, 1902.

Application filed May 5, 1902. Serial No. 105,907. (No model.)

My invention relates to the class of water cooled doors for f urnaces-sucl1as open-hearth furnaces, heating-furnaces,&c.and is designed to provide an improved construction which will not be liable to become cracked and will have a much longerlife than those now used.

It is further designed to provide a structure which can be easily and cheaply made from pressed steel plates or sheets.

In the drawings I show the body of the door as consisting of two plates 2 and 3, each pressed with continuous flanges 4 and 5 'ex tending entirely around them. The flange 5 of the outer plate is shallower than that of the inner plate, and the two are riveted together around theiredges, as shown. At the top and sides of the door the securing-rivets extend through an upper plate 6 and side plates 7 7, which extend inwardly beyond the shelves 2 and 3 and preferably converge inwardly. The plate 6 is secured to the side plates by bent angle-plates 8, riveted in their corners.

The door is provided at its lower end with a hollow cross-rail composed of shells 9 and 10, each having flanges l1 and 12 extending around them. These shells are pressed up from sheet-steel in the same manner as the shell of 2 and 3. The side plates 7 7 are socured to the ends of the lower rail by bent angle-plates 13, bolted to the side plates and riveted to the shell 9. The rivets at the top of the door extending through the shells 4 and 5 and plate 6 also extend through the flange of an angle 14, and a similar angle 15 is riveted'along the inner portion of the door and upon the inner part of the plate 6. The overhead connections for lifting and Fig. 2 is a ver-- tend rivets passing through the shells.

lowering the door may be secured between these angles. The water is supplied to the lower hollow cross-rail by a pipe 16, which extends downwardly at one side through a guide 17 and is connected to a pipe 18, leading into one end of the rail. The upper end of the pipe 16 may have a telescopic connection-with a water-supply pipe, the water passing from the lower rail through the U- shaped pipes 19 into the space between the shells 2 and 3, whence it flows out through an upper pipe 20 near one upper corner. I preferably provide a peep -hole 21 by forming holes in the lower part of the shells 2 and 3 and bolting or riveting a casting 22 between the shells and around the hole. Guides 23 are arranged horizontally above and below the peephole to receive the closing-plate, which may he slid within the guides to close or uncover the peep-hole. An air-cock 24 is preferably provided near the top of the outer shell,and the shells 2 and 3 are preferably held apart by spacing-collars 25,through which ex- The space inclosed by the top and side plates in the lower rail is filled with fire-brick or refractory material. g

The advantages of my invention result from the useof plates or sheets of steel, which are notliable to crack, as are the present castmetal constructions. These pressed sheets or plates give a simple and cheap construction, while the door is well protected by the refractory. lining and the water-cooling system.

Variations may be made in the form and arrangement of the door and its parts without departing from my invention.

1 claim V 1. A furnace-door formed at least inpart of spaced-apart sheets with pressed-up flanges extending at an angle to the plane of the door, and secured together, and a water inlet and outlet leading to the space between the sheets; substantially as described.

2. A furnace door having an inner and outer shell with pressed flanges secured to- ICO formed of pressed plates to form a waterspace between them; substantially as described.

7. A furnace-door having a body formed of pressed plates with a space between them, a lower sill extending inwardly beyond the pressed body, and means for feeding water to one of said parts and from said part to the other; substantially as described.

In testimony whereof I have hereunto set my hand.

L. L. KNOX.

Witnesses:

H. M. GORWIN, O. P. BYRNES. 

